Improvement in grate-bars



GEORGE D. PUTNAM, OF SALEM, MASSACHUSETTS.

IMPRVEMENT IN GRATE-BARS.

Specification forming part of Letters Patent No. IGLSSEP, dated April 13, 15575; applicaion tiled 4September 23, 1874.

To all lwhom lt may concern:

Be it known that I, GEORGE D. PUTNAM, of Salem, in the count-y ot' Essex and State ot Massachusetts, have invented a certain Improvement in Grate-Bars, of which the following is a specification:

This invention relates to that class of gratebars which are made with a web which snpports a series ot' independent projections which form the tire-surface ot' the grate, and which, being most exposed to the heat, are liable to be tirst destroyed.

The advantage is manifest. It is desirable that the points be readily attached and detached, and also, that when in place they may have such stability as will permit the tires to be freely raked without displacing the points.

This invention consists not broadly in the use of such points, but my improvement is limited to the peculiar construction, which, I believe, makes the bars better adapted for practical use.

In the annexed drawings, Figure l is a perspective View of one form ot' my improvement in grate-bars. Fig. 2 is a transverse section ot' the same.

The same letters of reference are used ill all the iigures in the designation of identical parts.

The grate-bar illustrated is composed otI a web, A, surmounted by a row ot' teeth, B, which ferm the fuel-supporting surface, and are ot' rhombic or rhomboidal form, and are so arranged that two parallel sides run parallel to the web. The teeth shown in Figs. l

and 2 are provided with square shanks b, titting corresponding square sockets a in the web, by which means the teeth are connected to the web, their shanks ttin g loosely in the sockets, so that they may be easily inserted or removed.

The projections being held in the web by a long shank tting loosely into a socket passing through the web, there is not only an increased radiating surface furnished to the web for keeping down its temperature, but the points are held more tirmly than by modes heretofore known for attaching the points by gravity merely, and in raking the tires they are less liable to be displaced than in cases in which a point on the upper edge ot the Web fitted into a slight cavity formed in the base of the projections which constituted the upper surface ot' the bars.

The sockets a are extended through the web, or, it' that is feather-edged so as not to permit the sockets to pass to the lower edge, then they may be made to connect with transverse holes, as shown. The purpose of this is to permit the cold air ot' the draft to pass upward into the sockets, and around the stems b, thus tending to keep down the temperature of the web A. This circulation will be sufticiently attained by reason of the rough sand-surfaces ot' the stems and sockets.

What l claim, and desire to secure by Letters Patent, is-

In combination with the web A ,constructed with the sockets a passing through it, the points or teeth B, constructed with shanks b fitting said sockets, substantially as set t'orth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE D. PUTNAM.

Witnesses:

D. E. SAUNDERs, Sr., ERAs'rUs BENNETT. 

